The <gx:Wait> tag is a valuable way to add a pause between elements of your tour. It looks like this:
<gx:Wait><gx:duration>2</gx:duration></gx:Wait>
You can specify the length of the pause by changing the <gx:duration> between the <gx:Wait> tags:
<gx:Wait><gx:duration>2</gx:duration></gx:Wait>
It usually goes between between two <gx:FlyTo> tags to create a pause:
...
<gx:FlyTo>
<gx:duration>5</gx:duration>
<LookAt>
(truncated to save space)
</LookAt>
</gx:FlyTo>
<gx:Wait><gx:duration>2</gx:duration></gx:Wait>
<gx:FlyTo>
<gx:duration>5</gx:duration>
<LookAt>
(truncated to save space)
</LookAt>
</gx:FlyTo>
...
The <gx:Wait> tag is also used after an <gx:AnimatedUpdate> to give the change time to run:
...
<gx:AnimatedUpdate>
<gx:duration>5</gx:duration> (change the duration of the fade here)
<Update>
<Change>
</Placemark>
<Style targetId="path_style">
<LineStyle>
<color>bfff0000</color>
<width>3</width>
</LineStyle>
<PolyStyle>
</Style>
</Change>
</Update>
</gx:AnimatedUpdate>
<gx:Wait> <gx:duration>5</gx:duration></gx:Wait>
...